Looks like the artist who did an artist’s rendition of a living Mars did a pretty good job:

http://en.wikipedia.org/wiki/Image:TerraformedMarsGlobeRealistic.jpg

Except one big, glaring hole – the craters! Why isn’t Earth all crater-y like that? Oh yeah, because we have erosion and biological processes erase and cover them up. I don’t believe we have any craters like that you can see from space, though we’ve been bombarded by Mars no less, I’ll bet. Psh.